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Old 05-04-2003, 03:22 AM   #16
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If you dont have enough back pressure the car won't run.

it needs enough back pressure so as not to work as an exhaust brake, what a truck uses, and not to little as to let all the petrol flow out the exhaust port.
thats the use of a tuned pipe to allow adjustment of the back pressure so that enough fuel/air will stay in the engine.

you would need to run testing too see if there is more or less back pressure.

It is very hard to tell really, but normally, with that pipe you would think there is a higher back pressure, but i takes longer for the exhaust waves to reach back to the motor, so its quite hard to explain a 2-stroke exhaust.
The re-bound of the exhaust waves tho is probably from the T-intersection near the back of the car.

Its very technical.
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Old 05-04-2003, 03:25 AM   #17
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plus how u say less backpressure cooler.
No, since you are loosing petrol, it will run leaner and run hotter.

but too much back pressure and you can sieze the engine.
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Old 05-04-2003, 03:27 AM   #18
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I actually made one of these exhausts for my car but i decided it was a bad idea and ditched it. It made the engine run a bit cooler but it was under-performing alot
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Old 05-04-2003, 03:31 AM   #19
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If you dont have the right length for your engine, the wave lengths will be wrong.
But more then likely by pure chance, Fiream has clonked the correct length on the head and it allows his to still perform, but at a lower temp.
it would be excellent if he could recreate it and we didnt loose pressure, then we'd have mad ass exhaust systems and lower running temps.
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